ABSTRACT Cloud computing offers distributed and shared computing resources and services that belong to different service providers and websites. Before truly benefiting from cloud computing, there are several issues associated to it that need to be addressed in the first place. One of the most important aspects that needs special attention pertains to the cloud security. Cloud computing has the important component as trust management. In this paper, we look at some security services practices like authentication, confidentiality and integrity as well as the trust management. A critical analysis of the trust models along with some gaps in the existing models is also reported herein.